A body covers the given distance first half of the time with a speed 58 kmph and second half of the time with a speed 75 kmph. Then the average speed of the body is.

Average Speed = Total dis tan ce  Total time  =S1+S2t1+t2 Where S1=V1t1=V1t2 S2=V2t2=V2t2∴ Average speed =V1t2+V2t2t2+t2                             =V1+V22=58+752=1332=66.50kmph